The smallest bone in your body is in your ear.
The stapes (stirrup), one of three tiny middle-ear bones, is about 3 mm long. It passes sound vibrations from the eardrum to the inner ear.
HISTORICAL ARCHIVE
Sources · October 26, 2026
Every claim from this day’s challenge, with its verdict, explanation and sources.
Round 1
Elephants never forget.
They do forget, but their memory is remarkable: they recognize dozens of companions and remember water sources across vast distances and years. Older matriarchs' memories help whole herds survive.
Urine is sterile.
Studies have confirmed that healthy bladders host their own community of bacteria, so urine isn't sterile — even before it leaves the body.
Round 2
Horses can't vomit.
A powerful one-way valve where the esophagus meets the stomach keeps food from coming back up. That's why a stomach blockage or colic can be life-threatening for a horse.
A year has 365 days.
A calendar year does, but Earth takes about 365.2422 days to complete one cycle of seasons. That extra quarter day is why we add leap days — and skip most century years to keep things aligned.
"Heat lightning" is a special kind of lightning caused by hot summer nights.
It's ordinary lightning from a thunderstorm too far away to hear its thunder. Hills, trees or Earth's curvature hide the bolt, so you only see its light reflecting off high clouds.
Round 3
Axolotls regrow entire limbs, spinal cord, and parts of their brain.
Instead of scarring, they regenerate near-perfect copies of complex body parts — a feat scientists are racing to understand.
Peanut butter can be turned into diamond.
It takes brutal lab conditions — carbon-rich paste heated to ~1,000°C under pressures mimicking Earth's lower mantle.
Antibiotics help you get over a cold or the flu faster.
Colds and flu are caused by viruses, and antibiotics only work against bacteria. Taking them for a virus won't help you recover and adds to antibiotic resistance.